In biological classification, what is the fundamental difference between a 'Category' and a 'Taxon'?

Options:

• A: Category is a concrete biological entity, while Taxon is an abstract rank.
• B: Category represents an abstract rank or level in the hierarchy, while Taxon represents a real, concrete group of organisms placed at that rank.
• C: Category is used only for plants, while Taxon is used only for animals.
• D: There is no difference; both terms are completely synonymous and interchangeable.

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